Vaporizer for liquid fuel



may 17, 1923;

BLACKWOOD 'VAPORIZER FOR LIQUID FUEL Filed Feb. 11. 1922 3 m j/mg/ Z. fiZachz/aad,

Patented July 1?, i923.

nairsn stares attain rarest HARRY L. BLACKVJOOD. OF SALEll/I, OREGON.

VAPOBIZER FOR LIQUID FUEL.

Application filed February T 0 all to 7mm it may concern Be it known that I, HARRY L. 'BLAOKWOOD, a citizen of the United States, residing at Salem, in the county of Marion and State of Oregon, have invented new and useful Improvements in Vaporizers for Liquid F uel, of which the following is a specification.

The present invention relates to vaporizers for liquid fuel and more especially to retorts for liquid fuel burners, such as are used to burn kerosene or gasolene in kitchen ranges, heaters, and the like.

t consists in the hereinafter described improved construction of the generator tube of such burners and specifically in the combination of such tube and a filler therefor of special design, whereby the flow of the liquid fuel is retarded and the fuel is distributed in small streams or films and vapor ized before it reaches the outlet end of the tube.

I am aware that cores or fillers have heretofore been used in the generator tubes of liquid fuel burners for the same purpose as that mentioned above, but in all instances with which I am familiar, the core or filler snugly fits the tube and is provided with helical grooves or other forms of tortuous passage; consequently they quickly foul up and are diliicult to remove for cleaning or replacement; the carbon and other residues of the fuel bake in the retort and makes it often impossible to remove the filler, thereby rendering it necessary to renew the whole retort. The object of my improved construction of filler is to attain the desired results of providing a tortuous passage for the liquid fuel at one end of the tube and for the gas at the other end, thereby lengthening the path of flow and restricting the area of the passage so as to distribute the fuel in small streams or films which are easily vaporized, while making the cleaning of the filler and tube an easy operation no matter how long they may have been in continuous use.

My improved filler does not snugly lit the inside of the generator tube but lies on the bottom thereof, leaving an eccentric space between it and the tube, and is provided with ribs or projections of such form as, in combination with said space, to retard and distribute the fuel but allow it a free passage, even after the device has been in use for a long time without being cleaned, when 11, 1222. Serial No. 535,780.

the carbon deposit begins to form an insulating coating of non-heat conducting mate rial within the tube. The preferred form of these ribs or projections is that of a righthand and a left-hand helix or screw-thread, the ribs being triangular or semi-circular in cross-section and those of the left-hand helix being interrupted where they cross those of the right-hand heliX, so to leave spaces between the sides of the latter and the ends of the interruptedsections of the former.

In the accompanying drawing, I have limited the showing to the tube and its filler, as the other parts of the burner may be any of the well known forms. One of the advantages of my filler is that it can readily be substituted for old forms of fillers in existing burners which have become clogged up, warped or otherwise inefficient or unusable.

In the said drawing,

Fig. l is a longitudinal section of a generator tube, showing my improved filler in elevation.

Fig. 2 is an end view of the filler shown in F ig. 1.

Fig. 3 is a cross-section on line 3-3 of Fig. 1.

Fig. 4a shows a modified form of end for the filler, and

Fig. 5 shows another modified form of end.

In these views, 1 is the generator tube, which may be of the ordinary form, being provided with means 2 at one end for connection to the burner, and with a cap 3 at the other end for connection to the oil sup ply. The filler consists of a cylindrical rod 4:, provided with the enlarged triangular ends 5, each face of which is notched, as shown at 6, to provide passages for the fuel and vapor. Between said ends the rod is provided with a right-hand helical rib 7, which is continuous from end to end, although in Fig. 1 there is shown an annular space 8 between each end of the helix and the adjacent head or end 5, and with aleft hand helical rib 9 which is interrupted or cut away where it crosses the rib 7, so as to leave spaces 10 on each side of the latter between it and the ends of such interrupted left hand rib sections 9. In the forms of Figs. 1 to 4, these ribs are shown as being substantially triangular in cross-section, but they may be semicircular or rounded, as

as- I shownin Fig. 5 at 11. angular ends 5 and the annular spaces 8, the ribs may be continued to and over the ends of the core or rod a, shown in Fig. L.

In all cases, the external diameter of the filler, measured over the ribs and triangular ends, if such be used, is less than the internal diameter of the tube 1, so that an eccentric space 12 is left around the filler, the latter resting on the bottom of the bore of the tube and being consequently perfectly easy to remove and replace at any time. The effect of the ribs of opposite pitch, one broken away Where it crosses the other, is to carry the fuel back and forth across the bottom of the tube as it engages first one and then the other of said ribs,

and to spread it'out in a thin film as it passes up the sides of the tube and past the ribs.

The rod or core and its ribs are an integral structure and may be cast, drop-forged or die pressed of bronze or the like, as best practice suggests.

Minor changes in the configuration of the ribs and the ends may obviously be made Without changing the gist of my invention, as it is expressed in the following claims.

Having thus described my invention, What I claim is:

1. A liquid fuel retort, consisting of a tubular member, and a filler comprising a solid core and an integral rib running around said core, said rib being of such a diameter as to contact With the bottom only of said member. 7

I 2. A liquid fuel retort, consisting of a tu bular member, and a metallic filler provided with an integral helical rib. of such diameter that it contacts only With the bottom of said member.

3. A liquid fuel retort, consisting of a tubular member, and a filler of less diameter than the inside of said member, said filler having helical ribs of opposite pitch to re-- tard anddistribute the fuel in its passage through said member.

4. A liquid fuel retort, consisting of a generator tube adapted to be connected at its ends to a source of fuel supply and a Instead of the triburner, respectively, and a filler for said tube of less external diameter than the in side diameter of the tube, said filler comprising a circular rod or core and helical ribs of opposite pitch, one of said ribs being interrupted Where it crosses the other.

supply at one end and to a burner at theother end, and a filler adapted to rest on the bottom of said tube so as to leave an eccentric space between them, said filler having helical ribs of opposite pitch, one rib being cut away where it crosses the other, and

triangular notched ends forming passages for the fuel and vapor, respectively.

7. A filler for generator tubes, consisting; of a rod having an integral continuous helical rib of one pitch and an integral. helical rib of the opposite pitch, spaces being left between the ends of the interrupted rib and the sides of the continuous rib to afford free paqsages for the fuel and vapor around said rot.

8. A. filler for the generator tubes of liq-- uid fuel burners, consisting of a cylindrical core provided With an integral continuous right-hand helical rib and With an integral. interrupted left-hand rib, spaces being left between the ends of the interrupted rib portions and the adjacent sides of the continuous rib to afford free passages for the fuei and the vapor, and the ends of the filler being also formed to provide .free passages for the same.

In testimony whereof I have hereunto set my hand.

HARRY L. BLACKWVOOD.

Witnesses:

FRANK E. HALIK, CLARENCE R. G'OODWIN. 

